Call-distributing system for telephone-exchanges.



- A.' H. wuss. CALDISTRIBUTING SYSTEMV'FOR TELEPHONE EXCHANGES. APPLICATION FILED NOV.-4.` 19:11- IIENEWE-D JULY I5 1912.. u 1,187,947, Patented J une 20, I916.

3 SHEETS-SHEET 1.

I 55:25.' n Ez/Euhm N 7% fyi/ ?EdHZ/ W- www@ N Him-mg A. H. WElSS. CALL nlsmmum SYSTEM For: TELiPHoNE EXCHANGES.

1 ".AfELlCATlON FILED NOV.4.1911- RENEWED .1ULV15, 1912. l a 187,947 @Menti-Pd Juno 20, 19113.

3 SHEETS-SHEET 2.

` A* A9 H. wiilss.l CALL DISTRI'BUTING` SYSTEM FOR TELEPHONE-EXCHANGES.

V v APPLICATION FIL'ED NOV-4, 19H- REN'LWEVD llJLY l5 19.12. 1,187,947;

3 SHEETS-SHEET 3- Infeuod June 20, i916.

- YUEZZZZJT: EZE/HZ/ D. @Z55 p ey it lmoivn l that I, Annalen VV'niss,` reding, at?Vflilnette;`` n the county of` Cook y y flillin isgFhave inventednevv and ,n 1Improvements` in Gall-Distributing ystemsygforj TelephonefEXchanges, of which following specification; Q1, i

systems` j for 4telephone exchanges 1; iin y which efirst idlercordycircuit ofa'plurality of upsfofgpcordxcircuits is automatically seed uponllinitiation; .of a3 call;` andrmore ticularly to means; for changingvthe nor-V `al startinggipoint `ot the selection `of the s`\ tchboard apparatus may be lequalized`,lan

ectfl'ieingto provide such a systenr` which is positive andeiiicient in" operation,` certain featuresn and @advantages thereof l being ointedout inthe speciiicatioin and: claims. `Infcall` distributing` or seiniautolnaticl sysnisvin Wliiehly nponinitiation a call a y"l"n"`g` sivitclilisfset innrotion` to automatithevcallingline" the first n p, `of plurality c'ifcord` cijijeuitsyleady diffe operatordtheeperatonhav n `her f cord circuits `connected 1 to the con tactsV nearest the normali point of the switch, llxreceiveftlie greatest number of calls and positionffwill receive `the greatest wear, `the next operator will* receive the second greatest nulnber ofl calls,` .the 1 `apparatus l ather positliusg` receiving y the` seconda greatest `ntpf yvear and "sol onalongthe dierent` ositionsn Vitlisuch `anjarrange- 1l be i "seenthat the. 1apparatus at seotionsfof the switchboard Willfbe c" toyniorelivear than others.`

feature of i my invention is fito provide p ator` oontrolledI nieanslwhereby the cord Vany` one of; a i group operators na "be: arranged," `to L receive the havin l access tofthemgroup of operators"` iore complete understanding of ny ention, @reference is to bellied ,to "the ac- Vnyingidrawings'inWhichff fj V urel` comprising parts l and s `2 iillus the circuit arrangementf'of t apparatus p n establishingfaticonnection` between` a calledsubstation.) Figg, 2" illuslagrarnniatically several; cord-selecinvention relates to distributing irdjllcircuitsaso*that Jtheyiwearfupcnl the therefore,followsthat the apparatus at her 11S 1 inconinglcallinitiated by a sublscribersy nND sU'rrrvooMPnNY, a coaroaa'rion or ILLINOIS.

` p y p .c `f3specification of Leiters :catene Patented June 20, 1916. applicati@ tlealnwemperfi, ieilgserii no. Stasia 'Renewed my 15, 1912. i serial No. 709,579.

, t tor` switches with their associated cord-circuits distributed among several operators positions at a switchboard.

VReferring now particularly to Fig. 1

parts 1 and 2, by placing part .2 to the right aan Rfvvnlss; orvvimvrnrrn, anuncis, assisuon To KnLLoee 'swrrennoann LS, each one of which is paired With a cordselector CS having its stationary contacts i terminating in cord-circuits C which are adapted forconnecti'on to called lines, one of which is illustrated comprising the substation D which is connected bymeans of line conductors 1, 2 to the linegcircuitfL". `A master switch MS is associate With switches LS and CS of part 1, bein common to a plurality of such pairs and adapted upon initiation of a call to automatically start a pair of such selectors LS and CS to connect" a calling linefwith an `idle cord-circuit. I have illustrated the apparatus4 for a single connection but assuming an exchange of one thousand lines, there Would be one thousand line circuits' L, preferably divided into ten `groups of one hundred lines each, each group of lines being preferably provided with ten lineselecto`rs LS 'which have their stationary contacts multiply connected tothe associated group of lines, While each line selectorrLS is paired With a cord-selectorCS. On a` basis as above outlined, for the one thousand line, one hundred cord-circuits C are provided, being preferably divided into ten groupsof ten cord-circuits each, each group of ten being` preferably disposed be `fore an operators position. Each cord-selector CS, of which there are one hundred,

is preferablyai'ranved to have access to `any of the ten groups of cord-circuits.` Therefore,'each cordselector CS has one hundred sets of stationary contacts divided into ten groups of `ten contact sets each, all of said cord-selectors having their contacts multiply connected. For eachtgroup of one hundred lines' andV associated"l ten linel and c-rd-se- Alectol's, a masterZ switch MS isprovided which is adapted upon initiation of a callv In the illustration the cord-selectors CS are A shown as having three circles o-r rows of stationary contacts and an associated wiper,

v each circle being divided 'into' three groups of three contacts each with 'a normal contact .between each that each cor selector CS has access to one oup, but as we have assumed hundred cord circuits C, each said cord selector' CS would have'one hundred sets of vstationary contacts divided into ten groups of ten contact sets each with a normal contact between each group. The'wipers of the cord selectors travel in the direction of the arrows indicated thereon and when started vvcontinue until connection is made with an busy continues in its travel until .the con-l tacts leading to an idle cordI circuitareidle cord. circuit, so that if all of the vc ord circuits of the first group are busy, a switch will continue'in its traveljto test thecord circuits of the second group and if they are reached. As is well known one ofthe principal oberal type of the one herein illustrated, 1s to concentratethe calls at the Aleast number of operators positions ,capable ofhandlng the calls, so that with systems'ofthe type of the present application, all of thecord-selectors are preferably arranged, to test first the cord circuits leading to the. first operators position, as ,is more fully illustrated in Fig. 2.

Fig. 2 which illustrates more clearly a preferred arrangement and distribution of the cord circuits, shows three cord selector switches CS, CS and CS2. Each switch CS has its. contacts divided into three groups to' correspond with .the arrangement of Fig: 1, part 1," the first group or group a having vits contacts .connected to the cord 'circuitsofv position 1 at the switchboard, thecontacts 'ofy group b being connected' with cord cir-v cuits of osition 2 and group" c being connected with the cord circuits of p ositlo'n 3. It` will be seen that with the switches arranged as in'Fig. 2 that the' cord circuits of ph'sition 1 will'be tested firstv and therefore it follows will receive the greatest number of calls,- position 2 the second greatest-number,

while the last position or position 3 will. re-

ceive the least numberwof .call.s,'thus' causing most wear upon thefiapparatus of the first position, thi'sivear occurringless as the positions advance., To provide' against the' disadvantages orobjections to call distributing- -systems as ljust outlined, I-'provide means for shifting the normalipositions of the Aswitches GS, CS,fetc., this'ineans including an operator controlled switch SW 'which is adapted to be rotated so that any one of its contacts may be left ungrounded, the` ungrounded contact determining the normal resting posi- 4understood is' duplicated as previously outlined, the calling substation A illustrated, isa well known form of substation-comprisin'g the usual switchhook and receiver hung "thereon, thus maintaining the lower switchhook contacts normally closed, the removalvv of the receiver allowing the switchhook to move upward interrupting the lower contacts andclosing the upper switchhook contacts.

i. Substation A also includes the usual call bell,

transmittenimpedance coil and condenser of the form of substation shown.

At the central office a line circuit'L .is connected to` substation A by means of line conductors l'and 2, the said circuit L including..-

a line -relay LR, a cutoff relay CO,- and called line terminals, preferably jacks 3 multiplyv connected to the line and distributed so as to Vbe accessible by the diderent operators ductors T and S are' multiply connected to the 'stationary terminals of line selectors LS,

t l at the switchboard. The tip and sleeve conjects of a call distributing system of the gen- LS,'etc'., which have access to said line, each 1 line being multiplyl connected to ten such.

switches LS.. Each switch therefore has one hundred sets'of stationarycontacts 4, 5, 6, connected to'the associated group of one hundred lines.

4vciated rate et mechanism 11 which has its .V lratchet wheel rigidly secured,` to the' shaft car# y f Arying the wipers 7 8, 9. -In the operation of Line selector LS is 4a well known form of rotary switch having three the switch LS, magnet 10 steps the wipers around to the contacts of a calling line where they remain'throughout the connection and t are not restored to any normal point,- but lafter disconnection remain in such a sea wiper such as 12, 13, 14, and 15, l1 mounted upon-a ysingle shaft and adapted to. beiV Each cord selector switchCSvcomprises. four circles of contacts, each cir e having" stepped from contact to contact by means of a well known pawl and ratchet arrangement whichis actuated by a motor` magnet 16.-

l armature to thelleftlor'tothe right accord-l are provided and the functions of these' Will be more particularly pointed out in the description of operation.

The-'called substation D is equipped similar to substation A being connected by line l conductors 1', 2, with a line circuit L Similar to linel circuitL, its equipmenthaving the same reference. characters as equipment of line circuit L but with 'the sulix prime. y

Operation.

Assuming that la subscriber atsubstation AV desires connection with another sub'- scriber, by= removing the receiver from his switchhook, a path for current through the line relay LR is established from battery through protective resistance and normal i' contact 49, line conductor 1, substation A,

`4ocontact 51 of .relay 37 is thereby closed .es-

tablishing a locking circuit for relay 371:0

', tact 71-,of're1a'y TR, `a locking circuit 'therefor is established from the groundedv test contact' 6 with which wiper 9 is inl engagement, The energizing path for the currentl for relay -TRy is 'traced from ground:

line conductor 2, normalcontact through the winding 'of relay LR to ground, ener-.

gizing said' relay vthereby removing the ground connections from the test contacts 6 of the calling line and due to the closing of its alternate' contact 39 `closing a vpath for current through relay 37 of the master switch, causing its energization.` Alternate ground at normal contact 52. Also upon energization of relay 37 its alternate contacts 53 and 54 lare-closed to.,cause the starting of a pair of line vand cord selectors LS` and CS in the following mainner: The test relays TR and TR are ener'fized, the ener-.\

gizing rpath for TR bein' traced -from -Aground' vthrough alternate Contact 53nor-.

mal contact'y 55, Wiper 29 alud contact 32, normal cont'act 56 and the Winding of relay TRv to battery, causing its energization, but without effecting the operation of switch LS until .relayHON energizes as will be described. 'Uponthe closing of alternateco'nthrough alternate contact 54, normal vcontact`57, wiper 31 and contact 34, normal contact 58, normal contact 59 and` the winding of relay TRto batterypcausing its energization whereby an energizing circuit for magnet 16 is closed, this circuit being traced Afrom' alternatingcurrent generator th'roughvthelwinding of magnet 16, alternatey contact 60 and normal 'contact 6l toile;

ground. Magnet 16 thereupon steps the wipers of switch CS intoengagement with the first setl of contacts, the wiper-5 moving into engagement with the first grounded plate62, thereby closing a circuit for off normal relay ON traced from said grounded plate' 62 over wiper 15, alternate-contact 63 and the winding of relay ON to bat# tery. Relay ON is thereby energized whereby its alternate Acontact 64 is closed, estab'- lishing a lockingl circuit for `said relay ON 15. The energization of relay ON effects the starting of the switch LS, but the operation of the lcord selector CS will first be to said contact 64 Afrom the grounded Wiper described although the two switches LS and CS are operating simultaneously. l

' The wipers of the lswitch CS'it will be remembered, were stepped into engagement with the first set of contacts,v and due to the openingof normalv contacts 6 5, 66 the line Wipers-12 and 13 areA disconnected from the talking strands T and S so as not to interfere vwith `any existingconnections While the wipers of switch CS are being advanced.4

Assuming that the first set of contacts 17, 18 and v19 Withwhich wipers 12,' 13 and 14 contact 19 is grounded so that a maintaining circuity for test relay TR is' effected, traced from the said grounded contactr 19, wiper14, alternate contact 67, normal contact 68 through the winding of relay TR"to battery.l Magnet 16 thereforehaving its circuit maintained closed, advances the wipers 12,

13, 14 and 15 another stepand continues to advance the wipers until an idle set of contacts are reached which we will assume. are the contacts connected to the cord circuit C illustrated. The cord circuit C 'being idle,

its test contact 19'is ungrounded and there- -fore the maintaining circuit for test relayl I'I R is interrupted, causing its denergiza-f tion and-thereby interrupting the circuit for magnet 16 whereby the wipers remain inert.

engage, lead to a busy cord circuit, its test..

los)

It,will be noted that normal contacts '22 of the circle of test contacts 19 are grounded,

'so that when Wiper 14 passes from one group of contacts to the next, the maintaining circuitfor relay TR will not bebroken.

As previously described relay ON was l' energized upon the first step of oft' normal l wiper 15, thereby closing an energizing'cir, cuit ormagnet 10 of line selector LS traced from ground through alternatecontacts 69, 70 andthe winding oft magnet 10 to alternating current generator, causing an operation-of magnet 10 which advances Wipers 'i 7 8 and 9 into engagement with vthe rst, set of 'contacts 5 and 6 respectively.A

assoto nornlal `line thereof *will be` lished, traced from" ground at normal contact 39 of relay LR, contact 6, Wiper 9, nor

anal contact 71, alternate contact 7G, conductor 77, contact 33 and Wiper 30, and the Winding oit' relay 38 to battery, causing its energizationand interrupting its4 normal contacts 52, and 57(the opening of nor-- y,mal contact 52 allowing relay B7 to dencrgize if no other line ofthe group is calling) and closing its alternate Contact 52 to establish a circuit for magnet 36, whereby said magnetv is energized and advanceswipers 29,

\ 3()` and 31 into engagement with the next set of contacts 32, 33, 34,' respectively. If these ,contacts lead to a busy `pair of line and-cord selectors, fthey will have their test contact 33 i grounded, whereby a maintaining circuit for relay 38 scstablished causing magnet 36 to y advance the Wipers of master switch MS f another step and this advancement continues until Wiper engages. an ungrounded con-` tact 33, Wherebythe `circuit for relay 38 v circuit is estabyls" is interrupted, causing itsY denergization whereby `the Wipers of the Inaster switch ,remain in engagement with theselected set of contacte leading to ain idle pair of selector switches. Should another line in the group g be calling, as previously stated, relay 37 `is:

maintained 4energized from the grounded alternate contact Y39 Tof the line relay of the calling line and therefore when the relayy 38 denergizes after an idle pair of selector switches have been selected as just described,

it will be seen that the selected pair will be started to seek connection with the other calling line. l f

Returning now to the Ycord selector CS, it will be remembered that Wipers 12, 13,

i 14 and 15 have been advancedto engage the contacts leading to theidle cord circuit C illustrated, and test relay TR therefore `deenergized, The closing of ,normal contacts y --66 of relay TR therefore establishes a continuity of the talking strands T and S from the cord circuit C to the calling substation A. l

It will be remembered that-cut-:ofl' relay CO Was energized by currentV through alternate contact. 74 of` relay TR', but upon the denergization of this relay current is supplied froln `battery throughthe Winding'of relay 41 and along the `sleeve conductor' i through the Winding of cut-`o`relay COv to y ground, causing the energization of relay 1, and this supply of current also flows through alternate contact 49, line conductor 1, substation conductor 2 `and backV over the t tipgconductor T to branch `conductor 77 and i through supervisory relay 40 to ground,

causing its energization, so that both super- Supervisory lamp signal 42 is .therefore energized by current over a path traced from battery through said signal 42, alternate Contact 78, and normal contact 79 to visory relays t0 and 41 are energized.`

ground. Also upon energization of relays 40,141, 'ground is'connectedto the test conductor Pto render cord-circuit C vunselectable, this ground connection being. traced fromyalternate contact' 80 of rela'y 40, normal contacts 81, 82, alternate contact 83 and over conductor P toits multiple rcontacts 19 rendering them busy.

In the operation of the'system` asjust described, it Was assumed lthat line selector LS connected with the terminalsof the calling linebefore its paired cord yselector CS connect'ed with the terminalsof` the cord circuit- 0.v We will now vassume that cord selector CS connects .with cord vcircuit C before selector LS connects with the-calling line.- In that case, as soon as Wipers v12, 13 and 14 connect with the terminals 17, 18

land 19 of` cord circuit C, which is an'idle .cord circuit, relay TR denerg'izesas before,

closing its normal'contacts 65, 66, but as switchl LS has not -completed connection with the calling line as yet its relay TR is still energized so that conductors T and S' are still interrupted at contacts 72, 73 of said relay TR.' A

It Will be remembered that in the previously described connection cut-olf relay` CO was initially energized by current from battery flowing through alternate contact V74 of relay TR', but in the present case, TRhaving denergized lbefore the line selector connects with the calling line, relay CO depends for energizing current from battery flowing through supervisory relay 41 of the cord circuit. This occurs in thefollowingmannerz'Upon connection of line .selector LS With the terminals of the calling line, relay TR de 'e'nergizes thereby closing its normal contact 71 and effecting the advancement of .the master' switch'wipers to the next idle pair of selectors in a man--' ner as previously described. Also upon delenergization of relay TR its contacts 72, 7 3

zation. It Will-'be noted that relay'41 ener- 4gized previous to relay 40 sol that 'a battery impulse Was connected to its conductor P flowing from battery through supervisory signal 42, normal contacts 78, 81, 82 alternate contact 88 to conductor P, and its multiple contacts 19, this flow of/'current continuing 'through wiper 14 to spring 67.

From spring 67 it will be noted that a path extends through normal Contact 67', polarized relay 26, alternate contacts 10064 to thev grounded Wiper 15, but to prevent a premature operation of polarized relay 26 at this time (which would effect the release of y the selector switches) a shunt circuit'ispro;

vided being traced from normal contact 672, alternate contact 58 and Wiper 31, normal contact 57 and alternate contact 54 to ground, as it Will be remembered that master switch MS does not move until the line has beenselected, which. inthis case Was subsequent to the 4selection of they cord circuit. From this it will be seen that-due to the shunt -path from ground to normal contact 672 polarized relay 26 is not prematurely operated, although current ,is connected to test conductor P as is done when a release is desired after conversationgis completed. The operator in response tothe signal 42, which is lighted in response to yrelays 40, 41, operates her listening key'K, thereby connecting her telephone set O tothev talking strands leading to the substatinvA, and finding that the calling subscriber desires connectionwith the substationfl), inserts, yplug 84 in a multiple jaclr'' -of'the called-' line without any preliminary ltesting orl subsequent operation of ringing keys, vas it will be remembered that the cord circuit C is arranged for automatic ringing and busy.

Called ,Zinc alla-Assuming that-fthe line:

'of substation I) is idle, thev sleeve ojack 3 is connected to ground .through cut-olii` relay CO', therefore'when plug 8,4 is inT ser-ted in the jack, a ioW of current through polarized relay 45 is established from the negative pole `of section 85 of battery B,

normal contacts 86,87, sleeve conductor S,

sleeve contacts of the plug and jack and the Winding of relay yCO to ground, `this flow being in 'a direction to move the armature 45 toward the left. .A circuit for sleeve supervisory relay 44 is therefore established from ground thrpugh contacts 45, 452 and the-Winding of relay 44 to' bat@` te`ry BLA Relay 44a/isr therefore energized closing lts alternate Contact 8,8 and connecting its Winding through normal contact 87 1n series with thewinding of cut-oli' relayl CO, this 'circuit maintaining the-tivo relays 44, CO energized Upon energlzation of 44, its norinal Contact 86`being interrupted, polarized` relay 45 returns tonormal. Due to the opening of norm-al contact 79 of rela-y 44, signal 42' is effaced and upon the closing oi" alternate rContact 79'supervisory signal 89 is lighted, this circuit being traced from ground at alternate contact 79, through normal! Contact 90 and signal 89 to normal Contact 81 of relay 44` disconnects the-initial :ground connection vto rthe test contact P, the closing of alternateconta'ct battery B. yAlthough the interruption of y magnet 1'7", but being" in a direction whereby Il the `tendency of polarized relay Q6 is ,to "pull its armature toward the right. Upon l the closing' of alternatecontact 101 of regis- `ter magnet?, it Willbe seen that a locking `l `circuit for; itselfisestablished through alfionralteriiate Contact 101 at the same time restoring' the grounded or lousy condition of ""i'conductorf-P and its multiple contacts `19 :uid also shuntingg` the Winding of polarized rnagliet 261,] whereby there is noattraction 3 `u`porrits` armature. V u y Retumingr new to the tip relay 43, upon its* energization its-alternate contact 102 is closed, thereby establishing the continuity I of the t'allmrfgV circuit between thesubsta- `tions A and Dfivhiclrmaybe traced over the ffheavily` marked conductors andliaring. the condenserslOS and 10i interposedT Talkt ing' current for substation througl'r relays 04411015 c l `j ujfhiletalking lcurrent i for substation `D is "supplied through relays 44E-13 of cord C foyer the paths previously 'traced-` yThe sub- "3 stations Auand `D are now connected for ord u circuit C,

comersation. u i l Release- Afterthe subscribers have finished conversationthey` replace their receivers upon their respective switchhook's,

interrupting thecircuit for tip relay zvhiclr denergizes, closing its normal `con- 8l`by current over tlvepreviously described u path. The] restoratic,l` `of the receiver` at `sul'istation interrupts the oW of current through tip rel`ay`40, causingits denergiza ion whereby supervisorylamp 42 is again `:lighted over a path traced from battery hrough lainp 42, ground atpalternate contact 105. `V` The" rater vinuresponse,tothetwo signalspwitl 1 draws plug" 8i from its connected `jack `lth`ereby interrupting the'` circuit of superdenergizing and restor "substation l) to normal.` The denergiztuit for relay` 98 at` alternate contact 79, llowing said relay'torestore, `While the p losing, of inormal Contact 81 of" relay 44` "connects battery to hereby eifecting, the ener `Zed. relay 26 tol cause ordselector GS.

t 1er restoration ofl` The energizing path for 26 istraced from bant,v periisory llar'np 42, :normal `intacts 7 8, 81,82, alternate contact 83, conductor l?, contact 19, `and Wiper '14, armaryture 67, normal Contact 67', the Winding ot polarized magnet 26, alternate contact 100,` he 'winding of relay ON, and battery, to ground. i It will he noted that the current 'usttraced is in e direction opposite tethat` wvisory relay:` andeutottfrelay CO', relay ingthe line of o` Q termite contact 91, this ground connection 4 A is suppliedexxx i the replacing ofthe receiver at substation `tact 90 and again lighting supervisory lamp i normal contact 78'to1 tion; of relay" 44 interrupts the locking vcirl tlietest condthictor P, u l

izationof polarj when 4battery 99 (which'is grounded oppositely to battery B) was connected with polarized relayaspreviously described, so that 1n -th1s instance the -armature of relay'26 e ternatecontact 107, thereby connecting batisf'attracted toward the left closing its al- ".tery through lamp 75and the winding of relay 28 to ground, causing its energization.

Contact 109 is thereby closed effecting lthe energization'of relay 27 by a flow of -battery through protective lamp 75, said alternate contact 109winding of relay 27, alternate contacts 100-64, tothe grounded wiper 15, whereupon relay 27 energizes 'battery through the windingof saidrelay' l series circuit.

closing its alternate contact 68 and establishing a circuit for relay lTIR traced from TR', alternate contact 68 winding of relay 27, through the previously described path upon energization ofrelay TR its' alternate contact 60 @is closed, thereby again establishing anenergizing circuit for motor magnet 16 over the previously Adescribed path l'from ground at normal contact 61, magnet '16, thereupon energizing and denergizing by, pulsations of current from the .alternating current generator and advancing wipers 12,13, 14 and 15 toward the normal resting point 15'..- I M46 wiper 15 in passing from a grounded seg- 'the circuit for oli:l normal relay ON until4 lthe Iwiper 15 'reaches the ungrounded con- 1 tact at itsnorma'l position. .It is to'be re- It will be noted that ment 62 toa grounded contact 152 and so on, makes before breaks, thus maintaining membered that relays ON, 27 and TR all 'were maintained energized during this re:

leasing operation `from the grounded wper 15, so that upon its reaching the ungrounded contact these three relays restore` to normal, thefrestoration ofl rela TR interrupting thercircuit for motor magnet 16` and pre.

venting any further advance of the wipers.

At thejcord circuit C it willbe remembei-ed that although relayv 40 was de'c'nergized when the subscriber at A restoredihis receiver, relay 41 still remained energized vdue to the flow" of'current through its Windinsg and cut'jof relay CO in series, but upon A` energization of relay TR this circuit for relay 41 was interrupted at'normal Contact 66allowing relay 41 to restore, thus cord circuit lCis againidle and in conditionto I be selected, asr the grounded or busy'condition .was removed from the test contacts 19 by the energization of relay TR. Al-

a 4windings of said relay to battery B, while though the energization of relay TRl caused I the restoration of relay 41 of the cord circuit, the closing of contact 74 of relay TR again connected battery through lamp 7 5 over the sleeve conductor to the cut-oli:1 relay CO maintaining it energized, but upon the final denergization of relay TR', that is,

when switch CS has restored, the cut-of relay is restored, while uponl denergization of off normal relay ON, due tothe interruption ofits alternate contact 76 ground is disconnected from the test contact 33 of the master switch so that the paired line and cord selectors LS and CS respectively are again available to b e started for establishing another connection. During the restoring movement of switch CS, relay 27 remaining energized as stated, its grounded alternate contact 122 .maintains testcontact 33 busy. H

the connection has been extended from a calling substation Ato the cord circuit C previously described, and the operator inserts plug 84 in a jack 3 of the' line of substation D which is busy. If the line of substation D be busy as a calling line, its

cut-oill relay CO is energizedH by current, l

from battery B flowing tiroi gh the winding of a supervisory relay 41, while if busy as a called line, its relay GO is energized by current from battery B zthrough a relay 44. 4Therefore, upon insertion of plug 84 into jack 3, the potential at the sleeve of the jack vis, greater than theeloeve vof the plug, due to the connection from` the sleeve of-the plug through polarized relay 45 to a middle point at battery B while the sleeve of the jack isv connected to section 85 of battery B, therefore, a flow of current will be effected in such direction that the armaturel 45 of relay 45 is attracted toward thel right, making connection with alternate Contact 45?' and establishing a circuit tor relay 111 which is energized,; closing its loolI contact 112 thereby-establishing a locking.- circuit for itself to ground at alternate' contact 113 of relay 41, and due to the interruption of its normal contactA 87 the ener.- gizing .circuit for relay 45 is interrupted allowing the restoration thereof. The closing of contact 114er' relay 111 establishes 'circuit for .relay 98 traced 4through the the closing of alternatecontact 82 of relay 111 connects battery B through the right hand winding oi relay 98 through alternate over contact 19, wiper 14, armature 67, normal contact 67, winding of polarized relay 26, alternate contacts 100, and 64 to the grounded wiper ing in a direction to cause polarized relay 15,-this flow of current be` contact 83 of relay 41 to conductor P, then 26 to attract its armature .toward the left and close alternate contact 107 to cause they Jiri:

ttery l d alternate l 1 @genou l to @estere tglcolt, l ed allowmgg the reetoifamon o for relays, ON,

Returning to Conil Circuit C if; will be rei011 Afetunfng over le condetvor l, wind ang Qieutreley CO to ground, ithus n- *.cleating to the calling subserlber i'nembered bha-t thesgnal 8S) is lighted, so

that when the relay TR" opens 1 its normal feitaeyG5-46fnt rxrupting the energizing i circuit for flelay ell); l fgizes clos V teblishln f from belfljery through mal Contacts 'to ground et alti-wute eonteei; 118, Altheugh 'theiuital energizll Ving "circuit for `rfeleny all `lmemmzpted.\ when 4 'normal Contact 66 relay TR isnter- Jtuptefda e eubstitute path' for-"said relay 4l provided upon ex'xergziltion of relay lll j duete thefclong of its alternate eenaeb, y] `whereby cui-'rent Hows tlufongh relay l-l, con

duel-o1? `119,1 `a,llzel'netehsmfwt S7 und then ,tluughfthesleevecntaets of the plug and jack and Winding of zut-ell relay CO to v grunds `The opel-awr Helling @he lluminw said Signal 452, no1" ,84 fromtlle mmeeted jack, whereby the cil-- l cult felxrelay le ulteruplle@ allowing 1t 133 1 thug mieu-upv alle interruption of' zrlerrmlze comen-ts and 1M. The :.pppa'srtes of cord clreullil is `new 'in been ,15eme ved :from l comme( ed eonmete l?, alffsileble fm? nher connue relay inte'upted, earner its resteaticm and 129 i3, 41,151 he normal( Upon di'ejlcllng Rommel, the locking ereulr. y and le ntlulfuptml, due to ille 'Wiper reaching e nomel my grounded c nme thus causing these relays lie `restore `as, before. l Uponrestomlion of said relay 1 533 of `Biestery smi fOI-e,` thus placing"Switches LSfimd in 7the gmiml connected tcl Contact ther'use in establishingether eneegons. I 33mm to 'mbe definite normal rellagloxi `between the wlpers of the cord selectlgfrs and;

pon its l n l M L) the elesnlg of me; normal com; whereby ,all energizing `elz'emt for me met 1G nel f trated, but aim to lcover all those changes and V modifications as come within tht,r spirit and their contacts and Aconnected cord circuits' with the hand switch SW in the position as' i. be changed, this change being eected upon the subsequent operation of the selectors inl the followin manner: Assuming, as stated, theswitch W was moved and contact 152 ungrounded upon "the subsequent operation.

of Switch es, a win be advanced to the erst idle cord circuit as usual which we will assume is cord circuit C connected with the first group of contacts 17, 18, 19. Thereafter when the switch CS is released its wipers are advanced until wiper lv reaches the ungrounded contact whereby the locking circuit forthe relays of selectors LS andCS 'is interrupted as before, thereby stopping switch CS with its wipers resting at normal point 152. Thus -it will be seen that due to theoperation of switch SW, the normal re*- lation' between the cord select or wipers and their contacts and connected cord -circuits has been changed, causing a different order of testing 'when a cord selector .is started to seek an idlecord circuit.

switch is started, and operator controlled means for varying the starting point of'said l switch whereby others of said cord circuits?? will be the first ones tested.

2. A telephone. system comprising aI lu.-`

-rality of cord circuits,`an automatic tr tieling switch, having stationarylcontacts con#l nected to said cord circuits, normal starting point for said switch whereby certain.;

ones of said cord circuits are tested firstv when the said switch is started, and'oper ator controlled means for'varying the startv ing point of said switch wherebyv others of said cord circuits will be the first ones tested.,

3. A telephone system comprising 'af'pluf ralit-y of cord circuits distributed among ,0D-

erators positions'at'a switchboard, an auto'-v lVhile I have illustrated a plurality of batteries, it is to be understoodthat all of the batteries with the exception of battery 99 may be one andthe sameas it will be noted that battery 99 has a negative pole grounded, while the other batteries have a positive pole grounded, the plurality of batterles 'lhaving been shown-"that the drawings might be sim lifiedfgfjf Y A though I have incorporated my in vention in a particular telephone system, ,it is apparent that it'inay bexapplied to s stems o various characters.' 'Also with .re e`r-ence\. to the grouping of the cord 'clrcuits at the selectors and the division of the 'cord 'circuits at .the different operators positions, it is to be understood that various changes and- Inodifications thereof may be made, and therefore I do not desire to be llmited to the exact arrangement of `my inyention as illusscope of the appended c laims.

' What .I claim as new 'and desire to secure by `United States Letters Patent is:

. 1. A telephone systeml comprising a plurality of cord circuits, an automatic traveling switch for testing said cord circuits in 'regular order for connection thereto,ywherebya certain one is tested firstwhen said firstones tested.

`matic traveling. switchv having I stationary contacts connected in regular lorder tofsaid i.

cord circuits, a normal starting point for' said switch Vwhereby a certain4 one of. said cord circuits is tested first when the said s witch is started, and manually controlled means for varying the Astarting pointof said switch whereby others of' said cord circuits will be `the first onestested. g

4. A telephone system comprising aplurality of cord circuits, an automatic travel- V ingvswitch having stationary contacts divided into groups and connected to said cord circuits, aV normal startlng point for Said 'switch whereby the cord circuits of a'certain group are tested first when said switch is started, and operator controlled meansv for l varying the starting point ofsaid'switch` whereby the cord circuitsof any other group' will be the first ones/tested.-

5. A telephone system comprising groups of cordcircuits distributed among operators. J

positions' at a sw/itchboard, an automatic traveling'switch having stationary contactsl .connected to the groups of cord circuits, a

normal starting pointfor said switch whereby the cord circuits of a certain'n groupl are j tested vfirst when said switch is'started, and manually controlled means for varying the starting point of' said switch wherelT the cord clrcuits of other groups vwill be the 6, A telephone system comprising a'plurality of cord circuits'distributed among oerators positions at a switchboard., an automatic traveling lswitch having;I stationary' contacts connected .to said'cord circuits, a traveling wiper for connecting to4 saidv stationary contacts, there beingra definite normal relation between'said wiper andsaid contacts whereby the cord circuits of a certain group are tested first kwhen said switch is started, and voperator controlled means for varying the normal relation between said wiper .and said cordcircuitswhereby the cord circuits of any other group will be -the first ones tested.

' 7.-,A "zgtelephone system comprising teleconnected Iwith said` link circuits, a wiper iiicludeediinsaid-switch `toi' connecting with Jing link selector liavng stationarir contacts `saicl contaets,[ saicl wiper having a (leiiite noriiiaLrelation "to its contacts; and link cir "cuits, electrical apparatus for driving said.

Wiper and testingsaiil link circuits, and a "manually operatedswitch at .the exchange electrically connected with said selector yadapted` when operateilto change tlic iioruial or unoperated. relation between said wiper and liiilCoii'cuits. g i

12` A, telephone system comprisingr a pliil rality'of cord circuits, a traveling corel selector having stationair",1 contactsconnected witlrsaicleord circuits, a' Wiper for said se-- lector having a definite iiornial relation to -V its` contacts whereby when ,operated said contacts and link circuits are tested in a preflete 'mined order, means for operating said' i Wipers, and means tor Varying tbe normal position `of said Wiper.

13. Aeall distributing system. comprising a plurality of `operators link circuits, a

`tr( Veling selector, having stationary contacts 1 connected with said link circuits and divided into groups, a wiper for said selector, nor inally resting `before one oi said groups of "contacts" whereby when operated the said contacts and link circuits are tested first, means for operating said Wiper, and oper- 1 atei' controlleci niean'swliei'ebji tlie norinal position of said wiper may be shifted to en gage others of said group first when operatecl.` i

14. A call distributing system, coii'iprising a plurality of cord circuits vdivided into groups and eacb `group terminating at a i clili'erent operators position, a' traveling cord seleotoi-` bai/ing stationary contacts connected ifvitli said corel circuits, a Wiper for said selector bai/'infi :i `definite norinal rela tion 'to lits contacts whereby when operated the said contacts and link circuit-s are tested in apredetermined oixlei.- as to groupe, means for operating said Wiper,A and iiieansflor Varying" the normal'iosition oi? said Wiiviei: Wlierebyotlier groups of sind contacts and linlrcireuits will be tbe first ones tested.

` Aftelephonesysteni coinin'ising televplionelines,` operators link circuits, `automatic switches for interconnecting said lines aiidlinli; lgireuits,` inenns whereby said link circuitsfaie)connected tosaid lines in a ce1'- tain order 'of precedence, and an operator controlled electrical switch for \f:i,i' `yiiig the order offljirecedence aiiil iviaintaining the `link circuitsselectable! 16; A call distributing system comprising a plurality of operators link circuitsl iliviflecl into groups, a traveling cord selector llim/ing stationary contactsconnected with said lint: eircuitsra `Wiper for said select-or having a ,cleinite normal relation toy its contacts whereby when operated tbe said contacts electrical switch for .testing and maintaining the link circuits seand the link circuits lare tested in a predetermined order, and an operator Controlled electricall switch for 17 A telephone system comprising rality of link circuits, an automatic tra-Vol ing switch for testing said circuits in regu-` lar order for connectlon' thereto' and Where.-` by a certain one is tested first -When said Y switch is started,.and anoperator controlled varying thegorder of lectable.

phone lines, operators link circuits divided into groups,

varyin "the order` of- .testing and maintaining the 'nk circuits sc- 'lectable y different groups.v of taken foruse.

, v j Witness-es.; 18.1Af telephone system comprising tele-tv U l automatic switching mechanism for interconnecting said lines and llink Signed by me at Chicago, coiintylof Cook,

and State of Illinois', in the presence oftwo Witnessesl y '1 i ALFRED H. -WEISS GEoRonE. MniiLLiaR, v

CARRIE E. ANDERSON. 

